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MARINECO Informe resumido

Project ID: ICA2-CT-2000-10049
Financiado con arreglo a: FP5-INCO 2
País: Russia

Hydrogen production by seawater electrolysis and its features

Among other means of energy accumulation and reservation the particular significance is the possibility to set up of an electrolytic hydrogen and oxygen production directly from seawater, the electrical conductivity of which is due to soluble salts.

Seawater is the most widespread, cleanest and cheapest working medium, its resources are practically unlimited. In turn hydrogen is an ecologically pure fuel with the greatest specific heat of combustion. Seawater is a multicomponent natural electrolyte with sodium chloride as the main component.

Therefore the seawater electrolysis will be basically determined by the near-electrode processes, which are intrinsically for the sodium chloride solutions electrolysis. While electrochemical reaction at acceptable rates some amount of chlorine always evolves together with oxygen.

In view of chlorine being toxic, the problem of its utilization is to be solved. For example, utilization of chlorine can be achieved through absorbing of it by the aqueous solution of sodium hydroxide.

The reaction can proceed in directions resulting in hypochlorite or sodium chlorate formation. An anolyte formation of sulfuric acid is possible too.

Therefore apart from the essential electrolysis products - hydrogen and oxygen, in the course of seawater electrolysis one can produce sub-products, possessing self commercial values.

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